New York City Air Quality
New York City, New York · 8.3M population
Moderate
2024 avg
58
Annual AQI
2024 average
7.2 μg/m³
PM2.5
1.4× WHO limit
183
Clean Days/yr
AQI ≤ 50
42
Unhealthy Days/yr
AQI > 100
Monthly AQI Pattern
Monthly average AQI — peaks June–August (ozone season)
NYC's Air Quality Transformation
From Black Smoke to Clean Air
In 2000, NYC's PM2.5 averaged ~22 μg/m³. By 2023, it had fallen to ~7 μg/m³ — a 68% reduction. The turnaround came from cleaner vehicle fuel standards, the retirement of dirty boiler fuel (No. 4 and No. 6 heating oil), the closure of in-city power plants, and expansion of mass transit. NYC now has the cleanest air of any major US city relative to its population density.
The 2023 Wildfire Smoke Wake-Up Call
On June 7, 2023, NYC recorded an AQI of 484 — hazardous and the worst in recorded history. Smoke from Quebec wildfires created an orange sky over Manhattan and prompted outdoor activity advisories. This event showed how dramatically distant fires can overwhelm local air quality improvements, and how a warming climate threatens the gains of decades of clean air policy.
Building Heating Oil: The Last Big Source
Unlike LA (vehicle-dominated) or Chicago (industrial), NYC's biggest remaining local pollution source is building heating — specifically older boilers burning dirty residual fuel oil. NYC's Local Law 97 (2019) mandates buildings cut emissions 40% by 2030 and 80% by 2050. The city's Clean Heat program has already converted thousands of buildings from No. 4 and No. 6 oil to cleaner alternatives.
Environmental Justice: The Bronx
Air quality is unequal across NYC boroughs. The South Bronx — with the highest truck traffic in the US, multiple waste transfer stations, and the Cross Bronx Expressway — has asthma rates 3–4× the national average. Environmental justice advocates have fought for decades to reroute diesel trucks away from residential streets and close polluting facilities near schools.
Air Quality by Borough
Manhattan
~55Dense traffic, but good ventilation between towers
Brooklyn
~58Highway proximity varies by neighborhood
Queens
~60JFK airport diesel, industrial areas in western Queens
Bronx
~72Highest diesel exposure; truck routes, waste transfer
Staten Island
~52Cleanest borough; suburban, less traffic
Borough estimates based on NYC DOHMH Community Air Survey data.
Frequently Asked Questions
What causes New York City air pollution?
NYC's pollution comes from traffic (especially diesel trucks and buses), building boilers burning heavy fuel oil, power plants in NJ and upstate NY, and Canadian wildfire smoke. The 2023 Quebec wildfire smoke event pushed NYC AQI to 484 — the worst ever recorded. Local sources are improving; distant wildfire smoke is the new wildcard.
Is NYC air quality improving?
Yes — dramatically. NYC's PM2.5 dropped ~70% between 2000 and 2024, from ~22 μg/m³ to ~7 μg/m³. The city's Clean Heat program converted thousands of buildings from dirty heating oil to cleaner fuels. However, Canadian wildfire events (2023, 2024) show that distant pollution can now overwhelm local improvements.
When is NYC air quality worst?
June–August bring the worst ozone pollution as summer heat and sunlight convert vehicle and industrial exhaust to ground-level ozone. Wildfire smoke events (typically June–September) are unpredictable but can produce the highest single-day AQI readings. Cold winter days with stagnant air can trap PM2.5 from building heating.
Should I wear a mask in NYC?
On typical days, no mask is needed. NYC's average AQI is 'Moderate' — generally safe for healthy adults. On wildfire smoke days (AQI 150+), N95 or KN95 masks provide effective protection against PM2.5 particles. Surgical masks and cloth masks do not adequately filter fine particles.